Hi @andypiper
I tried changing the tag you suggested, and also tried removing the og:image, but it didn’t make any different. 
I think the way Blogger handles images may be confusing the handler. Blogger displays a small image, which links to the actual image. It seems like the image displayed, which is already cropped, is the one that Twitter is using.
Searching the forum, I found this post Blurry images with Twitter cards and Blogger
I’m wondering whether that would be a better way for me to implement the tags? If so, is there a way to add a fallback og:image tag, so that if I tweet a link to my homepage, which doesn’t have a featured image (that’s why I included the og:image tag in the code I’m using at the moment), it can display a image, instead of the generic folder icon that Twitter uses?
Update - I tried switching the code, but nothing changed. 